Gameplay Fixes and Ancient Map Improvements

This update focuses exclusively on gameplay, animation, and map-specific bug fixes. There are no changes to item supply, demand, or market mechanics.

[ MISC ]

Fixed silencer attach and detach animations
Fixed a bug that prevented refunding the Bizon
Fixed a bug where players could respawn into a bad state during reconnect
Fixed a bug where ramps were not correctly reducing fall damage
Fixed a case where sub-tick movement timestamps were temporarily incorrect after changing host_timescale
Various fixes and improvements to de_ancient